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| Property | 95% Alumina | 99% Alumina |
| Density | ≥ 3.6 g/cm³ | ≥ 3.8 g/cm³ |
| Flexural strength | ~280 MPa | ~320–350 MPa |
| Max service temperature | ~1,400°C | ~1,700°C (1,800°C intermittent) |
| Thermal conductivity | ~22 W/m·K | ~28–30 W/m·K |
| Volume resistivity (RT) | 10¹⁴ Ω·cm | 10¹⁵ Ω·cm |
| Corrosion / alkali resistance | Good | Excellent |
| Relative cost | Baseline | ~20–40% higher |
The glassy second phase that binds the 95% body improves sinterability and lowers cost, but it is also the weak point: at sustained high temperature or in aggressive chemical media, that phase is what softens, corrodes or allows grain-boundary attack.
Choose 95% alumina for: general wear protection (liner tiles, chute liners, guide plates), electrical insulators below 1,000°C, spray and sandblast nozzle bodies in moderate duty, and structural parts where cost dominates.
Choose 99% alumina for: furnace and kiln components above 1,400°C, thermocouple protection tubes for precious-metal sensors, semiconductor and electronic substrates demanding low loss and high purity, corrosive chemical contact (acids, molten salts), and high-frequency insulating parts.
A useful rule: if the part fails by wear, try 95%. If it fails by heat, corrosion or electrical leakage, pay for 99%.
Regardless of purity, insist on: fired density data, shrinkage consistency for dimensional repeatability, CTE values if mating to metal, and lot-level inspection reports. A supplier certified to ISO 9001 with EU environmental testing — as Freceramic's products are — removes much of the sourcing risk in either grade.
Yixing Furui'en Special Ceramics Co., Ltd. manufactures 95% and 99% alumina ceramic tubes, rods, sheets, substrates and nozzles, plus zirconia and cordierite products, with custom machining in-house. With 30+ years of manufacturing experience, the company helps OEMs select the grade that fits duty and budget — contact Freceramic for material datasheets and quotations.
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